A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade dbus-broker | Oct 11, 2026 | Aug 31, 2026 |
| Redhat_linux | — | Upgrade dbus-broker-debugsourceUpgrade dbus-broker-debuginfoUpgrade dbus-broker | Jul 27, 2026 | Jul 23, 2026 |
| Rocky_linux | — | Upgrade dbus-broker-debuginfoUpgrade dbus-brokerUpgrade dbus-broker-debugsource | Sep 2, 2026 | Sep 1, 2026 |
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